Heat economizer for furnaces



L. D. SUMMERS HEAT EcoNoMIZER FOR FURNACES Filed Janv 14 1925 .fallinllllllflllllllllllllllill!!n "f/ m2' QW-D @C5-WW INVIA-1v TOR.

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BY M if M ,4 T TORNEYQ.

Patented Dec. 8, 1925i UNITED STATES PATENT oFFlcE.

LOUIS D. SUMMERS, 0F SPRINGFIELD, ILLINOIS, ASSIGNOR TO FIRM OF FRANZ AND SUMMERS, CONSISTING 0F LOUIS D. SUMMERS, FRED FRANZ, JR., AND WILLIAM J'. FRANZ, OF SPRINGFIELD, ILLINOIS.

HEAT EcoNoMIzEa Foa renuncias.

Application filed January To all whom z't may concern:

Be it known that I, Louis D. SUMMERS. a citizen of the United States, residing at 701 Fayette Ave., Springfield, in the county of Sangamon and State of Illinois, have invented a new and useful Heat Economizer for Furnaces, of which the following is a4 specification.

,'My invention relates to devices that are adapted to secure a maximum of benet from the heat normally passing out of a furnace flue as wasted heat; an object being in this device not only to provide more heating surface but also to provide a device that will temporarily retain the products 0f combustion from the furnace, within a chamber for heating a series of fresh air tubes where the fresh air is adapted to become heated on its circuit through the rooms to which the heat is distributed.

A particular object of my invention is to provlde a heat economizer to be used with oil, coke or gas burning furnaces and the like, that will be adapted to take advantage of the control of the movement of the commonly wasted heat from the furnace in a manner that will most efficiently secure a maximum of benefit therefrom while the same is at its highest temperature. In the meantime I provide in th1s same devicev a means for prolonging the time during which the hot gases will continue to heat the fresh air flues.

My invention embodies a construction of heat economizer that is adapted to be made of metallic parts such as galvanized sheet iron or the like together with such other details of construction that will combine the merits of strength and scientific relation of parts for this urDose.

The intende novel features of construction of my device will be hereinafter more fully described in the annexed specification, recited in the claim and illustrated in the accompanying drawings, in which like reference numerals indicate the same structural parts in the figures.

Referring to the drawings, Fig. l is a per'- spective of the heat economizer of my invention partially cut away, showing the interior construction and in general showin the relation of the economizer in its severa details to a furnace with which it may be operatively connected.

14, 1925. Serial' N50. 2,317.

economizer of my invention showing thereinthe related details of construction and operation thereof.

The preferred embodiment of my inventlon and the methods of securing the desired results therein will now be pointed out, as references are made to the several numerals in the respective figures illustrating the Adevice of my invention.

Among other successful arrangements by which intended results may be secured by gravity feed and the like with a heat economlzer of my invention is an arrangement illustrated in Fig. 1 whereby a yfurnace -3- 1n being used as an oil, coke or gas burning furnace may' be provided with a blower pipe -2- and a motor driven blower -1- which is adapted to force a draft for the burning oil fuel. In this connection attention is called to the fact that normally a furnace is provided with a cold air intake l5- and a series of heat distributing units -5- and a flue pipe -6- which has been normally connected to a house fiue heretofore, but in the heat economizer of my invention I provide an upright drum '-9- having a heating hood -11 which hood is provided with -a series of heat distributing units 12 and a secure cover 18. Drum .-9- is adapted to be mounted upon and secured to a cold air intake compartment 4 the interior of which compartment is shown at -7. Heating hood 11 provides a heat accumulating chamber for heated fresh air, and this hood compartment communicates with fresh air intake compartment -7- below, through a series of up-right, parallel, spaced, heat conducting, fresh air communicating flues 10. These flues are shown with the upper parts lof most of the same cut olf in order to more clearly illustrate their spaced relation.

It will be seen that the products of combustion that normally pass out of flue -6- and become wasted are in this case directed to a cent-rally disposed chamber for economizing the same.

This economizing chamber is formed by a base plate -17- secured to an opening of like size in pipe -4-. This base plate is provided with a pluralityof spaced apertures over which -a like number of fresh air tlues `10- are seated and welded; and in this connection it will be noted in Fig. 1 that said fresh air fines are arranged in convenient up-right parallel spaced relation.

The top ends of this group of fresh air lines are secured to'a second metallic plate 16- similar to plate -17- and having a similar number of apertures therein and cach in vertical alignment with a corresponding aperture in the lowerplate. It will be noted that the upper ends of the above mentioned fresh air flues are each secured to plate -16- and so positioned as to communicate with the corresponding apertures within.

A sheet of galvanized iron forming the drum 9 encompasses plates -16- and -17- in the preferred manner illustrated in Fig. 1 and is secured to these plates so as to encompass the periphery thereof. A heating hood -11- is mounted upon and coinciding with the periphery of drum Slwhich normall `communicates with pipe -4- through resh air flue pipes 10-.

With this arrangement it will be seen that the enclosing drum -9- forms a gas chamber -8-. through which iues -10- extend.

In setting up the economizer, drum 9 with its contents, including the upper and lower plates and the group of fresh air communicating tubes, is seated into position upon pipe -4- after which heatino` hood `11 is fitted into place on top ofa drum -9- where it issecured by fasteners 719- and tits drum -9- along line -20-.

After the economizer of my invention has been assembled in a correct manner the intended method of operating the same is as follows: The circulating fresh air comes into pipe -4 through intake pipe -15- to the hot air hood of the furnace while another part of it passes up through the group of fresh air communicating tubes -10- and becomes heated While thus passing, after which it passes on to heating hood 11 from which it is normally distributed through pipes l2- to the desired rooms for heating the same.

The products of combustion without this economizer would normally pass out to the house chimney flue i4- through pipe J6- but I accomplish with the device of my invention a decided economy in heating, by saving and utilizing this heat that normally has been going up the chimney. I accomplish this economy of heat by running the products of combustion through pipe -6- from the furnace into the upper side wall of chamber -8- where it will ,be seen that the said products of combustion will be thrown into contact with the external surface of the fresh air liues 10"- as they extend up through chamber -8-. Here it will be seen that when the heated gases heat the group of up-right-fresh air ues it causes the fresh air which passes there-through to become heated by conduction.

In this connection it will be particularly noted that the hot gases entering chamber -8- enter at the maximum temperature coming from the furnace through flue -6- and naturally will produce the greatest heatl about the upper ends of the flues -10-; but as it gradually tends to get cooler it. will normally settle slowly to a lower level. When it has reached its coolest relative t'emperature while in chamber 8 it will be at the bottom thereof and will then pass out to the house chimney through pipe -13-.

It will therefore be seen that the products of combustion do not pass out of chamber 8- until they have settled to a low level by heat gravitation through gradually lowering temperatures before passing out to the house chimney, through plpe 13 which connects with the lower side wall of drum -9- for the normal discharge of said products of combustion.

To those skilledv in the art it will be evident that a conspicuous merit in the economizer of my invention lies in the detail of construction which permits the heated gases from flue -6-- to remain in heat chamber ,-8- in contact with flue pi es -10- for an extended length of time be ore surrendering their greatest temperature and more especially do these gases heat the fresh air lues at their upper end which is nearest the heat accumulating hood -11- from which the heated fresh air is promptly distributed through distributing units -12-. It will be observed that fiues -10- by being in an 11p-right position are adapted to continue to be heated by the products of combustion oven While such gases are going through the process of surrendering temperature and settling to a lower level through heat gravitation.

It will also be evident to those vskilled in the art that th'is economizer may be adaptable to certain minor changes without de .parting from the spirit and scope of this linvention or sacrificing any of the intended merits thereon; it being evident, for instance that the heating drum -9- which encompasses the heating chamber could be cylindrical or rectangular rather than hexagonal as shown. Having thus described the nature of my invention what I claim as new and useful and desire'to' secure by Letters Patent is:

A heat economizer of the character described spaced from and operatively connected with an oil or coal burning furnace; said economizer comprising an upright drum including an upper detachable fresh air accumulating hood for heated fresh air, a chamber for the accommodation of the heated products of combustion from the furnace chamber; a fresh air intake pipe adapted to simultaneously supply fresh air for the furnace to heat and fresh air for the economizerto heat; said hood provided with a plurality of heat distributing' units and said chamber of the economizer connected with the flue of the furnace at the upper portion of the chamber and provided with an outlet ue 10 communicating with the lower end of the chamber so as to utilize to the maximum extent the heated gases eminating from the furnace. v

In witness whereof I hereunto set my 15 hand and seal this 10th day of January, A. D. 1924. LOUIS D. SUMMERS. [1.. s.] 

